Bracing Piece, Back Frame, and Backlight System of Flat Panel Display Device

ABSTRACT

The present invention provides a back frame of a flat panel display device. The back frame includes at least two assembling pieces. The at least two assembling pieces are joined to form the back frame. The back frame further includes a bracing piece, which is of a multiple-stepped configuration and is mounted to the assembling piece. The present invention also provides a bracing piece and a backlight system. The back frame and backlight system of flat panel display device of the present invention make the structure of a back frame mold simple, reduce the cost of back frame mold, save the material used for the back frame, and lower down the cost of flat panel display device. Further, the bracing piece of the back frame is applicable to various mounting heights of mounting holes, can be manufactured together in a unified manner, reduces the cost of mold, and improves manufacturing efficiency.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of displaying techniques, andin particular to a bracing piece, a back frame, and a backlight systemof a flat panel display device.

2. The Related Arts

The state-of-the-art liquid crystal display device comprises a frontbezel, a panel, and a backlight module, of which the backlight modulecomprises a back frame, a reflector plate, a light guide, and a lightingassembly.

Currently, a variety of display panels of different sizes are availablein the market to meet different needs of general consumers. For example,in the field of television set, the sizes of liquid crystal panelsinclude 31.5, 42, 46, 48, and 55 inches. Different back frame molds areprovided for liquid crystal planes of different sizes.

Referring to FIG. 1, FIG. 1 is a schematic view showing a conventionalback frame of liquid crystal display device. As shown in FIG. 1, theconventional back frame 10 is a unitary back frame, and it is often thata unitary back frame 10 is made with metal stamping or plastic injectionmolding. The unitary back frame 10 consumes much material and has a highmaterial cost. Further, a large-sized back frame 10 requires large-sizedstamping equipment, and the size of mold corresponding to such a backframe 10 is large and the structure complicated, making the expenditureof the back frame mold high. As a consequence, the conventional backframe is of a high cost.

SUMMARY OF THE INVENTION

The technical issue to be addressed by the present invention is toprovide a bracing piece, a back frame, and a backlight system of a flatpanel display device, wherein the bracing piece in the back frame isapplicable to various mounting heights of mounting holes, can bemanufactured together in a unified manner, reduces the cost of mold, andimproves manufacturing efficiency.

To address the above technical issue, the present invention adopts atechnical solution that provides a bracing piece of flat panel displaydevice. The bracing piece comprises a first step surface and a pluralityof second step surfaces that integrally formed at one end of the firststep surface, the first step surface forming thereon at least one bump,the bump forming a mounting hole, the first step surface being of adifferent vertical levels with respect to each of the second stepsurfaces.

According to a preferred embodiment of the present invention, thebracing piece further comprises a plurality of third step surfacesintegrally formed at an opposite end of the first step surface, thefirst step surface being of a different vertical level with respect toeach of the third step surfaces.

According to a preferred embodiment of the present invention, the backframe comprises at least two assembling pieces, the at least assemblingpieces being joined to form the back frame, the back frame furthercomprising a bracing piece, the bracing piece being of amultiple-stepped configuration and mounted to the assembling pieces.

To address the above technical issue, the present invention adopts atechnical solution that provides a back frame of flat panel displaydevice. The back frame comprises at least two assembling pieces, the atleast assembling pieces being joined to form the back frame, the backframe further comprising a bracing piece, the bracing piece being of amultiple-stepped configuration and mounted to the assembling pieces.

According to a preferred embodiment of the present invention, thebracing piece comprises a first step surface and a plurality of secondstep surfaces that integrally formed at one end of the first stepsurface, the first step surface forming thereon at least one bump, thebump forming a mounting hole, the first step surface being of adifferent vertical level with respect to each of the second stepsurfaces, whereby one of the second step surfaces is selected to fix tothe assembling pieces according to a mounting height of the mountinghole.

According to a preferred embodiment of the present invention, thebracing piece further comprises a plurality of third step surfacesintegrally formed at an opposite end of the first step surface, thefirst step surface being of a different vertical level with respect toeach of the third step surfaces, whereby one of the second step surfacesis selected to fix to the assembling pieces according to the mountingheight of the mounting hole

According to a preferred embodiment of the present invention, the backframe comprises a plurality of primary assembling pieces, the primaryassembling pieces being joined to form a main frame structure of theback frame, the primary assembling piece comprising a first primaryassembling piece and a second primary assembling piece, the firstprimary assembling piece having an end forming at least two jointsections, each of the joint sections having a structure mating an end ofthe second primary assembling piece, the first primary assembling pieceusing one of the joint sections to join the corresponding end of thesecond primary assembling piece.

According to a preferred embodiment of the present invention, the atleast two joint sections are arranged to space from each other in alengthwise direction of the first primary assembling piece

According to a preferred embodiment of the present invention, the jointsections comprise recesses formed in a surface of the first primaryassembling piece and having a shape corresponding to the end of thesecond primary assembling piece for receiving the end of the secondprimary assembling piece.

According to a preferred embodiment of the present invention, the jointsections comprise recesses formed in a surface of the first primaryassembling piece, the second primary assembling piece having a surfaceforming protrusions at corresponding positions, the protrusions beingreceivable in the recesses to join the first primary assembling pieceand the second primary assembling piece to each other.

According to a preferred embodiment of the present invention, the secondprimary assembling piece has an end having a surface forming at leasttwo protrusions that are arranged to space from each other in alengthwise direction of the second primary assembling piece.

To address the above technical issue, the present invention adopts atechnical solution that provides a backlight system. The backlightsystem comprises a light source, a light homogenization mechanism, and aback frame; and the back frame carries the light source and the lighthomogenization mechanism. The back frame is a back frame of the backframe described in the above embodiments.

The efficacy of the present invention is that to be distinguished fromthe state of the art, the present invention provides a back frame and abacklight system of flat panel display device that make the structure ofa back frame mold simple, reduce the cost of back frame mold, save thematerial used for the back frame, and lower down the cost of flat paneldisplay device. Further, the bracing piece of the back frame isapplicable to various mounting heights of mounting holes, can bemanufactured together in a unified manner, reduces the cost of mold, andimproves manufacturing efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a conventional back frame of liquidcrystal display device;

FIG. 2 is a schematic view showing a flat panel display device accordingto a first embodiment of the present invention;

FIG. 3 is a schematic view showing a back frame of a flat panel displaydevice according to a second embodiment of the present invention;

FIG. 4 is a schematic view showing a back frame of a flat panel displaydevice according to a third embodiment of the present invention;

FIG. 5 is a schematic view showing a back frame of a flat panel displaydevice according to a fourth embodiment of the present invention;

FIG. 6 is a schematic view showing a joining structure of a flat paneldisplay device according to a fifth embodiment of the present invention;

FIG. 7 is a schematic view showing a diagonally-arranged first secondaryassembling piece mounted to a main frame structure of a flat paneldisplay device according to a sixth embodiment of the present invention;

FIG. 8 is a schematic view showing a first secondary assembling pieceand a second secondary assembling piece mounted to a main framestructure of a flat panel display device according to a seventhembodiment of the present invention;

FIG. 9 is a schematic view showing joint sections of a back frame of aflat panel display device according to an eighth embodiment of thepresent invention;

FIG. 10 is a cross-sectional view showing a first example of jointsection of FIG. 9;

FIG. 11 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aninth embodiment of the present invention;

FIG. 12 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to atenth embodiment of the present invention;

FIG. 13 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aneleventh embodiment of the present invention;

FIG. 14 is a schematic view showing a joint section of a back frame of aflat panel display device according to a twelfth embodiment of thepresent invention;

FIG. 15 is a schematic view showing a joint section of a back frame of aflat panel display device according to a thirteenth embodiment of thepresent invention;

FIG. 16 is a flow chart showing a method for manufacturing a back frameof a flat panel display device according to a fourteenth embodiment ofthe present invention;

FIG. 17 is a schematic view showing a flat panel display device with atouch screen according to a fifteenth embodiment of the presentinvention;

FIG. 18 is a schematic view showing a stereoscopic display deviceaccording to a sixteenth embodiment of the present invention;

FIG. 19 is a schematic view showing a plasma display device according toa seventeenth embodiment of the present invention;

FIG. 20 is a schematic view showing a bracing piece according to aneighteenth embodiment of the present invention; and

FIG. 21 is a cross-sectional view of the bracing piece according to theeighteenth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 2-3, FIG. 2 is a schematic view showing a flat paneldisplay device according to a first embodiment of the present inventionand FIG. 3 is a schematic view showing a first embodiment of a backframe of a flat panel display device according to a second embodiment ofthe present invention. As shown in FIG. 2, the flat panel display device20 according to the instant embodiment comprises: a backlight system 21and a display panel 22. The backlight system 21 is arranged on a backside of the display panel 22 and supplies light to the display panel 22.

In the instant embodiment, the backlight system 21 comprises a lightsource 25, a light homogenization mechanism 24, and a back frame 23. Theback frame 23 carries the light source 25 and the light homogenizationmechanism 24. When the backlight system 21 is an edge lighting type, thelight homogenization mechanism 24 is a light guide; and when thebacklight system 21 is a direct type, the light homogenization mechanism24 is a diffuser plate. The back frame 23 comprises at least a firstprimary assembling piece and a second primary assembling piece, and thetwo of at least a first and second primary assembling pieces constitutea main frame structure 27 of the back frame 23.

Referring also to FIG. 3, the back frame 23 of the first embodimentcomprises a first primary assembling piece 261 and a second primaryassembling piece 262. The first primary assembling piece 261 has an endjoined to an end of the second primary assembling piece 262, and thefirst primary assembling piece 261 has another end joined to another endof the second primary assembling piece 262 in order to form the mainframe structure 27 of the back frame 23. The first primary assemblingpiece 261 and the second primary assembling piece 262 are both aluminumpieces or galvanized steel pieces. In the instant embodiment, the firstprimary assembling piece 261 and the second primary assembling piece 262are L-shaped.

Referring also to FIG. 4, the back frame 23 of a second embodimentcomprises a first primary assembling piece 281, a second primaryassembling piece 282, and a third primary assembling piece 283. Thethree primary assembling pieces 281, 282, and 283 are assembled andjoined to form a main frame structure 27 of the back frame 23. The threeprimary assembling pieces 281, 282, and 283 are all aluminum pieces orgalvanized steel pieces. In the instant embodiment, the first primaryassembling piece 281 is L-shaped, and the second and third primaryassembling pieces 282, 283 are straight linear.

Further, the back frame 23 further comprises secondary assembling piecesarranged inside and joined to the main frame structure 27.

A detailed description will be given to the back frame 23 of the flatpanel display device 20 according to the present invention, whichcomprises four primary assembling pieces and two secondary assemblingpieces.

Referring to FIG. 5, FIG. 5 is a schematic view showing a back frame offlat panel display device according to a fourth embodiment of thepresent invention. As shown in FIG. 5, in the instant embodiment, a backframe 23 comprises: a first primary assembling piece 231, a secondprimary assembling piece 232, a third primary assembling piece 233, afourth primary assembling piece 234, a first secondary assembling piece235, a second secondary assembling piece 236, and bracing pieces 2371,2372, 2373, 2374, 2375, 2376, and 2377. The first primary assemblingpiece 231, the second primary assembling piece 232, the third primaryassembling piece 233, and the fourth primary assembling piece 234 aresuccessively joined to each other in an end-to-end manner to constitutea rectangular main frame structure 27 of the back frame 23. The firstsecondary assembling piece 235 and the second secondary assembling piece236, serving as ancillary assembling pieces, are arranged in the mainframe structure 27 and joined to the main frame structure 27.

Specifically, an end of the first primary assembling piece 231 is joinedto an end of the second primary assembling piece 232, another end of thesecond primary assembling piece 232 is joined to an end of the thirdprimary assembling piece 233, another end of the third primaryassembling piece 233 is joined to an end of the fourth primaryassembling piece 234, and another end of the fourth primary assemblingpiece 234 is joined to another end of the first primary assembling piece231 in order to form the rectangular main frame structure 27. The firstprimary assembling piece 231, the second primary assembling piece 232,the third primary assembling piece 233, and the fourth primaryassembling piece 234 are all aluminum pieces or galvanized steel pieces.In the instant embodiment, the first primary assembling piece 231, thesecond primary assembling piece 232, the third primary assembling piece233, and the fourth primary assembling piece 234 are straight linear,yet in other embodiments, it is apparent to those skilled in the art tomake all the first primary assembling piece 231, the second primaryassembling piece 232, the third primary assembling piece 233, and thefourth primary assembling piece 234 L-shaped, or some being straightlinear and the remaining being L-shaped. For example, in FIG. 3, thefirst primary assembling piece 261 and the second primary assemblingpiece 262 are both L-shaped; in FIG. 4, the first primary assemblingpiece 281 is L-shaped, while the second and third primary assemblingpieces 282 and 283 are straight linear.

In the instant embodiment, the back frame 23 of the flat panel displaydevice 20 is formed by joining connection. As shown in FIG. 6, anillustrative example is given for the connection of an end of the firstprimary assembling piece 231 to an end of the second primary assemblingpiece 232, wherein the end of the second primary assembling piece 232 isjoined to the end of the first primary assembling piece 231 by means offor example screwing, fastening, or welding, to have the end of thesecond primary assembling piece 232 connected to the end of the firstprimary assembling piece 231.

In the instant embodiment, the first secondary assembling piece 235 andthe second secondary assembling piece 236 are arranged in the main framestructure 27 of the back frame 23. An end of the first secondaryassembling piece 235 is joined to the first primary assembling piece 231and another end of the first secondary assembling piece 235 is joined tothe third primary assembling piece 233; and an end of the secondsecondary assembling piece 236 is joined to the first primary assemblingpiece 231 and another end of the second secondary assembling piece 236is joined to the third primary assembling piece 233. Further, the secondprimary assembling piece 232, the fourth primary assembling piece 234,the first secondary assembling piece 235, and the second secondaryassembling piece 236 are arranged parallel to each other. In otherembodiments, those skilled in the art may arrange at least one secondaryassembling piece in the main frame structure 27. For example, only thefirst secondary assembling piece 235 is arranged in the main framestructure 27. Further, the two ends of the first secondary assemblingpiece 235 can be selectively joined to at least two of the primaryassembling pieces of the first primary assembling piece 231, the secondprimary assembling piece 232, the third primary assembling piece 233,and the fourth primary assembling piece 234. For example, the firstsecondary assembling piece 235 is set diagonally in the main framestructure 27, as shown in FIG. 7. Similarly, the two ends of the secondsecondary assembling piece 236 can be selectively joined to at least twoof the primary assembling pieces of the first primary assembling piece231, the second primary assembling piece 232, the third primaryassembling piece 233, and the fourth primary assembling piece 234. Forexample, the two ends of the first secondary assembling piece 235 arerespectively joined to the first primary assembling piece 231 and thesecond primary assembling piece 232 that are adjacent to each other andthe two ends of the second secondary assembling piece 236 arerespectively joined the third primary assembling piece 233 and thefourth primary assembling piece 234 that are adjacent to each other, asshown in FIG. 8.

In the instant embodiment, the back frame 23 comprises seven bracingpieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377. The bracing piece2371 is fixed to the fourth primary assembling piece 234; the bracingpieces 2372, 2373 are both fixed to the first secondary assembling piece235; the bracing piece 2374 is fixed to the second secondary assemblingpiece 236; the bracing piece 2375 is fixed to the second primaryassembling piece 232; and the bracing pieces 2376, 2377 are each fixed,at two ends thereof, to the first secondary assembling piece 235 and thesecond secondary assembling piece 236. In practice, the bracing piecescan be fixed to one or more of the first primary assembling piece 231,the second primary assembling piece 232, the third primary assemblingpiece 233, the fourth primary assembling piece 234, the first secondaryassembling piece 235, and the second secondary assembling piece 236. Inother embodiments, those skilled in the art may mount bracing pieces ofany other numbers to the back frame 23, such as one or more bracingpieces. Further, the bracing pieces can be releasably fixed to one ormore of the first primary assembling piece 231, the second primaryassembling piece 232, the third primary assembling piece 233, the fourthprimary assembling piece 234, the first secondary assembling piece 235,and the second secondary assembling piece 236.

The bracing pieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377 may beprovided with bumps (not labeled) so that the back frame 23 may fixcomponents, such as circuit boards, with such bumps.

Molds for making the back frame 23 will be described. In the instantembodiment, the first primary assembling piece 231 and the third primaryassembling piece 233 are of the same size and shape so that they can bemade by stamping with the same mold. The second primary assembling piece232, the fourth primary assembling piece 234, the first secondaryassembling piece 235, and the second secondary assembling piece 236 areof the same size and shape so that they can be made by stamping with thesame mold, making it possible to share the mold. Thus, the back frame 23of the present invention can be made by stamping with only twosmall-sized molds, and compared to the conventional back frame 10 thatrequires a large-sized mold, the molds for making the back frame 23 ofthe present invention are simple in structure and small in size and thusthe cost of mold for the back frame 23 can be lowered. Further, comparedto the whole back frame structure of the conventional back frame 10, theback frame 23 of the present invention can significantly save materialused and thus reduce the manufacturing cost of the flat panel displaydevice 20.

Referring to FIG. 9, FIG. 9 is a schematic view showing joint sectionsof a back frame of a flat panel display device according to an eighthembodiment of the present invention. As shown in FIG. 9, in the instantembodiment, an end of the first primary assembling piece is providedwith two joint sections, and the joint sections have a structure matingan end of the second primary assembling piece so that the first primaryassembling piece can be joined to a corresponding end of the secondprimary assembling piece.

Specifically, the first primary assembling piece 231 has an end formingjoint sections 2311, 2312, and the joint sections 2311, 2312 arearranged in a spaced manner in a lengthwise direction of the firstprimary assembling piece 231. The joint sections 2311, 2312 are formedby forming recesses having a shape mating an end of the second primaryassembling piece 232 in the first primary assembling piece 231 in orderto receive the end of the second primary assembling piece 232 therein.As shown in FIG. 10, the joint sections 2311, 2312 are recesses that donot extend through opposite surfaces of the end of the first primaryassembling piece 231 and the recesses are of a rectangular shape withthe second primary assembling piece 232 being straight linear.

To assemble a large-sized back frame 23, the joint section 2311 that isclose to the very end of the first primary assembling piece 231 is firsttaken and a second primary assembling piece 232 having a correspondingwidth is selected. Afterwards, an end of the second primary assemblingpiece 232 is positioned in the recess of the joint section 2311. Andthen, means, such as screwing, fastening, or welding, is applied to joinand fix the end of the second primary assembling piece 232 to the jointsection 2311. To assemble a small-sized back frame 23, the joint section2312 that is distant from the very end of the first primary assemblingpiece 231 is first chosen and a second primary assembling piece 232having a corresponding width is selected. Afterwards, an end of thesecond primary assembling piece 232 is positioned in the recess of thejoint section 2312. And then, means, such as screwing, fastening, orwelding, is applied to join and fix the end of the second primaryassembling piece 232 to the joint section 2312. Specifically, forexample the second primary assembling piece 232 forms a protrusion at acorresponding location on a surface thereof, and the protrusion of thesecond primary assembling piece 232 is embedded in the recess the firstprimary assembling piece 231 at a corresponding location in order tojoin the first primary assembling piece 231 and the second primaryassembling piece 232, as shown in FIG. 11. Further, the second primaryassembling piece 232 may form, on one end thereof, at least twoprotrusions that are spaced in the lengthwise direction of the secondprimary assembling piece 232, such as two, three, or four protrusions.

Furthermore, the recess of the first primary assembling piece 231 can bea recess of a multi-stepped configuration and the second primaryassembling piece 232 forms, at a corresponding location, a protrusionhaving a multi-stepped configuration corresponding to the recess, asshown in FIG. 12. Further, as shown in FIG. 13, taking the joint section2311 as an example, the recess of the first primary assembling piece 231forms, in a bottom thereof, a first through hole 2313, and the secondprimary assembling piece 232 forms, at a location corresponding to thejoint section 2311, a second through hole 2321. The back frame 23further comprises a fastener 240. The fastener 240 extends through thefirst through hole 2313 and the second through hole 2321 to joint thefirst primary assembling piece 231 and the second primary assemblingpiece 232 to each other.

As shown in FIG. 14, in another embodiment of the back frame of flatpanel display device according to the present invention, the recesses ofthe joint sections 2311, 2312 of the first primary assembling piece 231are of a circular shape. Yet, in other embodiments, those skilled in theart may arrange the shape of the recesses to be other polygonalconfigurations, such as triangle.

As shown in FIG. 15, in another embodiment of the back frame of flatpanel display device according to the present invention, the jointsections 2311, 2312 are recesses that do not extend through oppositesurfaces of the first primary assembling piece 231, whereby an end ofthe second primary assembling piece 232 is movable within the jointsections 2311, 2312. For example, after the end of the second primaryassembling piece 232 is set extending beyond and joined and fixed to thejoint section 2312, the portion of extension is then trimmed off so thatthe length of the second primary assembling piece 232 that serves as aprimary assembling piece of the back frame can be adjusted.

In a practical application, the other end of the first primaryassembling piece 231 and both ends of the third primary assembling piece233 are all provided with two joint sections having a structureidentical to that of the joint sections 2311, 2312. The ends of thesecond primary assembling piece 232 and the ends of the fourth primaryassembling piece 234 may be subjected to specific designs or no designat all according to the application. For example:

(1) In a first situation, as shown in FIG. 10, the two ends of thesecond primary assembling piece 232 and the two ends of the fourthprimary assembling piece 234 are of no specific design. In other words,the ends are of the same structure as the remaining portions. Under thiscondition, in making a join with a selected joint section 2311 (2312) atone end of the first primary assembling piece 231 (the same applicableto the other end), if an attempt is made to change the width of the backframe 23, then the length of the corresponding second primary assemblingpiece 232 and fourth primary assembling piece 234 must be selectedaccordingly. Namely, if the joint section 2311 that is close to the veryend of the first primary assembling piece 231 is selected for joining,then no trimming is applied to the second primary assembling piece 232and the fourth primary assembling piece 234 or the portion that istrimmed off is short; if the joint section 2312 that is distant from thevery end of the first primary assembling piece 231 is selected forjoining, then the second primary assembling piece 232 and the fourthprimary assembling piece 234 are trimmed and the trimmed portion beinglong or short is according to the distance that the joint section isfrom the very end of the first primary assembling piece 231 being greator small; and

(2) In a second situation, it is similar to the first situation, but asshown in FIG. 11, the second primary assembling piece 232 and the fourthprimary assembling piece 234 use different protrusions to respectivelymate the first primary assembling piece 231 and the third primaryassembling piece 233 in order to realize change of width of the backframe 23; similarly, if a joint section 2312 other than the first jointsection 2311 that is close to the very end of the first primaryassembling piece 231 is selected for joining, then before or afterjoining, excessive portions of the second primary assembling piece 232and the fourth primary assembling piece 234 may be trimmed off.

This also applicable to a main frame structure 27 of the back frame 23that is formed by joining two L-shaped primary assembling pieces.

In summary, the present invention provides a back frame 23 having afirst primary assembling piece that is provided with at least two jointsections. The number of the joint section can be selected according tothe requirement of customers. In the instant embodiment, a descriptionis given to an example comprising two joint sections 2311, 2312. Thus,to prepare the molds for making the back frame 23, only two sets of moldare needed, namely one mold for a first primary assembling piece and theother mold for a second primary assembling piece. The first primaryassembling piece may be provided with a plurality of joint sections forjoining operation in order to form various sizes for the back frame 23.To assemble the back frame 23, based on the desired size of the backframe 23, the corresponding one of the joint sections is selected. Withthe joint section, the second primary assembling piece is joined to thejoint section of the first primary assembling piece and the other jointsection of the first primary assembling piece that is located outward ofthe joining location of the second primary assembling piece is trimmedoff to obtain a desired size of the back frame 23. Compared to theconventional technology that requires different back frame molds formaking different sizes of back frame 10, the back frame of the flatpanel display device 23 according to the present invention requires onlya mold for the first primary assembling piece and a mold for the secondprimary assembling piece 28 so that mold sharing among various sizes ofproduct can be realized and the molds used are of simple structures,allowing of reduction of expenditure of the molds for back frames.

The present invention also provides a mold for making a back frame offlat panel display device. The back frame mold is provided with a mainpattern for forming a primary assembling piece of the back frame and themain pattern comprises a sub-pattern that forms at least two jointsections on an end of the primary assembling piece. The primaryassembling piece comprises the previously discussed first primaryassembling piece and second primary assembling piece, corresponding tothe above mentioned main pattern; and the joint section comprises thepreviously discussed joint section of the first primary assemblingpiece, corresponding to the above mentioned sub-pattern. Repeateddescription is omitted herein.

As shown in FIG. 16, the present invention also provides a method formaking a back frame of flat panel display device. The method comprisesthe following steps:

Step 501: manufacturing at least first and second primary assemblingpieces, in which the first primary assembling piece has an end formingat least two joint sections, each of the joint sections having astructure that mates a corresponding end of the second primaryassembling piece; and

Step 502: selecting one joint section of the at least two joint sectionsaccording to a size of the back frame to join the corresponding end ofthe second primary assembling piece.

In the instant embodiment, when other joint sections are present betweenthe joining location of the second primary assembling piece and the endof the first primary assembling piece, before or after the step ofselecting one joint section of the at least two joint sections accordingto a size of the back frame to join the corresponding end of the secondprimary assembling piece, the other joint sections of the first primaryassembling piece that are located outward of the joining position of thesecond primary assembling piece are trimmed off. The first primaryassembling piece comprises the previously discussed first primaryassembling piece, and the second primary assembling piece comprises thepreviously discussed second primary assembling piece, and repeateddescription will be omitted herein.

As shown in FIG. 17, the flat panel display device 20 of the presentinvention further comprises a touch screen 29. The touch screen 29 isarranged on a light exit surface of the display panel 22 of the flatpanel display device 20. The flat panel display device 20 comprises: thebacklight system 21 and the above discussed display panel 22. Thebacklight system 21 is arranged at the back side of the display panel 22and supplies light to the display panel 22.

The backlight system 21 comprises a light source 25, a lighthomogenization mechanism 24, and a back frame 23. The back frame 23carries the light source 25 and the light homogenization mechanism 24.When the backlight system 21 is an edge lighting type, the lighthomogenization mechanism 24 is a light guide; and when the backlightsystem 21 is a direct type, the light homogenization mechanism 24 is adiffuser plate. The back frame 23 comprises at least a first primaryassembling piece and a second primary assembling piece, and the at leastone first and second primary assembling pieces constitute a main framestructure 27 of the back frame 23.

It is noted that the flat panel display device 20 of the presentinvention can be a liquid crystal display device or a liquid crystaltelevision.

The present invention also provides a stereoscopic display device 30, asshown in FIG. 18. The stereoscopic display device 30 comprises a liquidcrystal lens grating 31, a backlight system 32, and a display panel 33.The liquid crystal lens grating 31 is arranged on a light exit surfaceof the display panel 33. The backlight system 32 can be a backlightsystem of one of the above discussed embodiments, such as the backlightsystem 32 comprising the back frame 23. The back frame 23 comprises atleast first primary assembling piece and the second primary assemblingpiece. The at least first and second primary assembling pieces form amain frame structure of the back frame. Repeated description will beomitted herein.

The present invention also provides a plasma display device 40, as shownin FIG. 19. The plasma display device 40 comprises a plasma displaypanel 41 and a back frame 42. The back frame 42 is arranged at a backside of the display panel 41. The back frame 42 can be the back frame ofany of the previously discussed embodiments and repeated descriptionwill be omitted herein.

The present invention also provides a bracing piece that is applicableto the each of the above disclosed embodiments, wherein the bracingpiece is of a multiple-stepped configuration and is mounted to anassembling piece of each of the above embodiments.

Specifically, as shown in FIG. 20, a bracing piece 500 comprises a firststep surface 501, and the first step surface 501 comprise bumps 502,503, 504 formed thereon. The bump 502, 503, 504 forms in a centerthereof a mounting hole (not shown). The mounting holes of the bumps502, 503, 504 are cooperative with fasteners, such as screws, in anassembling operation in order to fix the bracing piece 500 to othercomponent of a back frame, such as a circuit board.

The bracing piece 500 further comprises a plurality of second stepsurfaces 505, 506, 507 that is integrally formed at one end of the firststep surface 501 and a plurality of third step surfaces 508, 509, 510integrally formed at an opposite ends of the first step surface 501.

Referring to FIG. 21, the first step surface 501 is of differentvertical levels with respect to the second step surfaces 505, 506, 507and also, the first step surface 501 is of different vertical levelswith respect to the third step surfaces 508, 509, 510. Selection of oneof the plurality of second step surfaces 505, 506, 507 can be accordingto mounting heights H1, H2, H3 of the mounting holes of the bumps 502,503, 504 in order to fix the assembling piece and selection is also madeto one of the plurality of third step surfaces 508, 509, 510 to fix anassembling piece. For example, in case the mounting hole requires amounting height of H2, then trimming can be carried out on the secondstep surface 506 and the third step surface 509 in order to remove thesecond step surface 507 that is connected to the second step surface 506and the third step surface 510 that is connected to the third stepsurface 509 from the bracing piece 500 so that the second step surface506 and the third step surface 509 can be respectively fixed to theassembling pieces.

Similarly, in the mounting hole requires a mounting height of H3, thentrimming can be carried out on the second step surface 505 and the thirdstep surface 508 to remove the second step surfaces 506 and 507 that areconnected to the second step surface 505 and the second step surfaces509 and 510 that are connected to the third step surface 508 from thebracing piece 500 so that the second step surface 505 and the third stepsurface 508 can be respectively fixed to the assembling pieces.

With the above described manners, trimming of the second step surfacesand the third step surfaces can be carried out according to actual needsfor assembling and thus the mounting height of the mounting hole can beadjusted. Certainly, no trimming may be needed if the widths of thecorresponding second step surface and third step surfaces are greaterthan widths of the assembling pieces.

The second step surfaces and the third step surfaces can be arrangedsymmetric or not with respect to the first step surface. In a practicaluse, the second step surfaces and the third step surfaces are preferablyarranged symmetric. Further, the numbers of the second step surfaces andthe third step surfaces can be changed according to practical needs andthe present invention imposes no specific limitation in this respect.

Thus, in the instant embodiment, the bracing piece 500 is provided witha plurality of step surfaces. After the bracing piece 500 is formed bystamping a metal plate, a trimming position can be selected according toa desired mounting height of a mounting hole so that excessive stepsurfaces can be trimmed off. Commonly used fastening measures, such aswelding and riveting, may then be adopted to fix opposite ends of thebracing piece 500 to the assembling pieces, and this is applicable tothe mounting heights of all sorts of mounting holes, thereby achievingthe purposes that the bracing pieces 500 that are set at differentlocation in a back frame can be of different mounting heights of themounting holes. Further, since the bracing piece 500 can be made astandard part that may be manufactured together in a unified manner sothat the mold cost is reduced and the manufacturing efficiency isimproved.

It is noted that, in the above described embodiments, the bracing piece500 are fixed to assembling pieces with the two ends thereof, yet in abackup embodiment of the present invention, the bracing piece 500 canalternatively be provided with only the first step surface and thesecond step surfaces, or only the first step surface and the third stepsurfaces. In an arrangement of only the first step surface and thesecond step surfaces, the one of the second step surfaces that isselected is fixed to an assembling piece so as to realize fixing at oneend. Similarly, in an arrangement of only the first step surface and thethird step surfaces, the one of the third step surfaces that is selectedcan be fixed to an assembling piece so as to realize one end fixing. Thearrangement of one end fixing described above also provides the sametechnical effect as that of the above described embodiment of two endfixing. With such arrangements, the back frame and backlight system ofthe present invention make the structure of a back frame mold simple,reduce the cost of back frame mold, save the material used for the backframe, and lower down the cost of flat panel display device. Further,the bracing piece disclosed in the present invention is applicable tovarious mounting heights of mounting holes, can be manufactured togetherin a unified manner, reduces the cost of mold, and improvesmanufacturing efficiency.

Embodiments of the present invention have been described, but are notintending to impose any undue constraint to the appended claims of thepresent invention. Any modification of equivalent structure orequivalent process made according to the disclosure and drawings of thepresent invention, or any application thereof, directly or indirectly,to other related fields of technique, is considered encompassed in thescope of protection defined by the clams of the present invention.

What is claimed is:
 1. A bracing piece of a flat panel display device,wherein the bracing piece comprises a first step surface and a pluralityof second step surfaces that integrally formed at one end of the firststep surface, the first step surface forming thereon at least one bump,the bump forming a mounting hole, the first step surface being of adifferent vertical levels with respect to each of the second stepsurfaces.
 2. The bracing piece as claimed in claim 1, wherein thebracing piece further comprises a plurality of third step surfacesintegrally formed at an opposite end of the first step surface, thefirst step surface being of a different vertical level with respect toeach of the third step surfaces.
 3. A back frame of a flat panel displaydevice, wherein the back frame comprises at least two assembling pieces,the at least assembling pieces being joined to form the back frame, theback frame further comprising a bracing piece, the bracing piece beingof a multiple-stepped configuration and mounted to the assemblingpieces.
 4. The back frame as claimed in claim 3, wherein the bracingpiece comprises a first step surface and a plurality of second stepsurfaces that integrally formed at one end of the first step surface,the first step surface forming thereon at least one bump, the bumpforming a mounting hole, the first step surface being of a differentvertical level with respect to each of the second step surfaces, wherebyone of the second step surfaces is selected to fix to the assemblingpieces according to a mounting height of the mounting hole.
 5. The backframe as claimed in claim 4, wherein the bracing piece further comprisesa plurality of third step surfaces integrally formed at an opposite endof the first step surface, the first step surface being of a differentvertical level with respect to each of the third step surfaces, wherebyone of the second step surfaces is selected to fix to the assemblingpieces according to the mounting height of the mounting hole.
 6. Theback frame as claimed in claim 3, wherein the back frame comprises aplurality of primary assembling pieces, the primary assembling piecesbeing joined to form a main frame structure of the back frame, theprimary assembling piece comprising a first primary assembling piece anda second primary assembling piece, the first primary assembling piecehaving an end forming at least two joint sections that are arranged tospace from each other in a lengthwise direction of the first primaryassembling piece, each of the joint sections having a structure matingan end of the second primary assembling piece, the first primaryassembling piece using one of the joint sections to join thecorresponding end of the second primary assembling piece.
 7. The backframe as claimed in claim 6, wherein the joint sections compriserecesses formed in a surface of the first primary assembling piece andhaving a shape corresponding to the end of the second primary assemblingpiece for receiving the end of the second primary assembling piece. 8.The back frame as claimed in claim 6, wherein the joint sectionscomprise recesses formed in a surface of the first primary assemblingpiece, the second primary assembling piece having a surface formingprotrusions at corresponding positions, the protrusions being receivablein the recesses to join the first primary assembling piece and thesecond primary assembling piece to each other.
 9. The back frame asclaimed in claim 8, wherein the second primary assembling piece has anend having a surface forming at least two protrusions that are arrangedto space from each other in a lengthwise direction of the second primaryassembling piece.
 10. A backlight system, wherein: the backlight systemcomprises a light source, a light homogenization mechanism, and a backframe; and the back frame carries the light source and the lighthomogenization mechanism, the back frame being a back frame claimed inclaim 3.